Texture Atlas Maker

import java.awt.Frame;
import java.awt.event.*;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;


public class OptionsDialog extends JDialog implements ActionListener, ItemListener
{
	private static final long serialVersionUID = 8668228916639817663L;
	private JTextField textTextToolDir;
    private JTextField textAlphaThresh;
    private JPanel panelMain, panelAlphaThresh;
    private JPanel panelPVRDir;
    private JPanel panelPVROptions;
    private JButton btnSelTextToolDir;
    private JButton btnClose;
    private JRadioButton btnPVR2bit, btnPVR4bit;
    private JCheckBox checkConvPVR;
    private ButtonGroup buttonGroupPVR; 
    private JFileChooser fc = null;
    private Properties properties;
    public OptionsDialog(Frame owner, Properties mainProperties)
	{
		super(owner, "Options");
		properties = mainProperties;
        panelAlphaThresh = new JPanel();
        panelPVRDir = new JPanel();
        panelPVROptions = new JPanel();
        
        //Add various widgets to the sub panels.
        addWidgets();
        checkPVR();

        fc = new JFileChooser(".");
		setContentPane(panelMain);
        pack();
        setVisible(false);
	}


    private void addWidgets()
    {
    	textTextToolDir = new JTextField(40);
    	textAlphaThresh = new JTextField(3);
    	btnSelTextToolDir = new JButton("...");
    	btnClose = new JButton("Close");
    	textTextToolDir.setEnabled(false);
    	textAlphaThresh.setEnabled(true);
    	textAlphaThresh.setToolTipText("Pixels below this threshold are considered transparent and will be trimmed");
    	btnSelTextToolDir.addActionListener(this);
    	btnClose.addActionListener(this);
    	btnPVR2bit = new JRadioButton("2 bit");
    	btnPVR4bit = new JRadioButton("4 Bit");
    	checkConvPVR = new JCheckBox("Convert PVRs");
    	checkConvPVR.addItemListener(this);
    	
    	String last = properties.getProperty("lastAlphaThresh");
        if (last != null)
        	textAlphaThresh.setText(last);
        else textAlphaThresh.setText("2");
              
        last = properties.getProperty("PVRType");
        if (last == null)
        	btnPVR2bit.setSelected(true);
        else 
        {
        	if (last.equals("2bit"))
        		btnPVR2bit.setSelected(true);
        	else if (last.equals("4bit"))
        		btnPVR4bit.setSelected(true);
        }

        last = properties.getProperty("TextToolDir");
        if (last != null)
        	textTextToolDir.setText(last);

        //Add a border around the select panel.
        panelAlphaThresh.setBorder(BorderFactory.createCompoundBorder(
            BorderFactory.createTitledBorder("Alpha Threshold"),
            BorderFactory.createEmptyBorder(5,5,5,5)));
        
        panelPVRDir.setBorder(BorderFactory.createCompoundBorder(
                BorderFactory.createTitledBorder("Location of PVRTexTool"),
                BorderFactory.createEmptyBorder(5,5,5,5)));

        panelPVROptions.setBorder(BorderFactory.createCompoundBorder(
                BorderFactory.createTitledBorder("PVR Options"),
                BorderFactory.createEmptyBorder(5,5,5,5)));
        
        panelAlphaThresh.add(textAlphaThresh);
        panelPVRDir.add(textTextToolDir);
        panelPVRDir.add(btnSelTextToolDir);
        panelPVROptions.add(checkConvPVR);
        panelPVROptions.add(btnPVR2bit);
        panelPVROptions.add(btnPVR4bit);

        buttonGroupPVR = new ButtonGroup();
        buttonGroupPVR.add(btnPVR2bit);
        buttonGroupPVR.add(btnPVR4bit);
        
        panelMain = new JPanel();
        panelMain.setLayout(new BoxLayout(panelMain, BoxLayout.PAGE_AXIS));
        panelMain.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));

        //Add the select and display panels to the main panel.
        panelMain.add(panelAlphaThresh);
        panelMain.add(panelPVRDir);
        panelMain.add(panelPVROptions);
        panelMain.add(btnClose);
    }
    
    public void actionPerformed(ActionEvent event)
	{
        if (event.getSource() == btnSelTextToolDir)
        {
            fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
            fc.setDialogType(JFileChooser.SAVE_DIALOG);
            File file = new File(textTextToolDir.getText());
       
            if (file.isDirectory())
            	fc.setCurrentDirectory(file);
        	int returnVal = fc.showOpenDialog(null);
        	if (returnVal != JFileChooser.APPROVE_OPTION) return;
            file = fc.getSelectedFile();
            String strDir = file.getPath();
            if (file.isFile())
            {
	            int pos = strDir.lastIndexOf(File.separatorChar);
	            if (pos != -1)
	            {
	            	strDir = strDir.substring(0, pos+1);
	            }
            }
            if (!strDir.endsWith(File.separator)) strDir += File.separator;

            textTextToolDir.setText(strDir);
            properties.setProperty("TextToolDir", strDir);
        	try
        	{
				properties.store(new FileOutputStream(AtlasFrame.savePlace), null);
			} catch (IOException e)
			{
                System.out.println("error: "+e.toString());
			}
		}
        if (event.getSource() == btnClose)
        {
        	setVisible(false);
            properties.setProperty("lastAlphaThresh", textAlphaThresh.getText());

            if (btnPVR2bit.isSelected())
                properties.setProperty("PVRType", "2bit");
            else 
                properties.setProperty("PVRType", "4bit");
            
        	try
        	{
    			properties.store(new FileOutputStream(AtlasFrame.savePlace), null);
    		} catch (IOException ex)
    		{
                System.out.println("error: "+ex.toString());
    		}
    		
        }
		
	}

	public String getTextToolDir()
	{
		return textTextToolDir.getText();
	}
	public boolean is4Bit()
	{
		return btnPVR4bit.isSelected();
	}
	public int getAlphaThresh()
	{
    	int alphaThresh = Integer.parseInt(textAlphaThresh.getText());
		return alphaThresh;
	}

	public boolean convPVR()
	{
		return checkConvPVR.isSelected();
	}
	
    private void checkPVR()
    {
    	btnPVR2bit.setEnabled(checkConvPVR.isSelected());
    	btnPVR4bit.setEnabled(checkConvPVR.isSelected());
    }
    public void itemStateChanged(ItemEvent ie) 
    {
    	checkPVR();
    }
}